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/* validate.c --- Validate consistency of DIGEST-MD5 tokens.
* Copyright (C) 2004-2025 Simon Josefsson
*
* This file is part of GNU SASL Library.
*
* GNU SASL Library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* GNU SASL Library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with GNU SASL Library; if not, see
* <https://www.gnu.org/licenses/>.
*
*/
#include <config.h>
/* Get prototypes. */
#include "validate.h"
/* Get strcmp, strlen. */
#include <string.h>
int
digest_md5_validate_challenge (digest_md5_challenge *c)
{
/* This directive is required and MUST appear exactly once; if
not present, or if multiple instances are present, the
client should abort the authentication exchange. */
if (!c->nonce)
return -1;
/* This directive must be present exactly once if "auth-conf" is
offered in the "qop-options" directive */
if (c->ciphers && !(c->qops & DIGEST_MD5_QOP_AUTH_CONF))
return -1;
if (!c->ciphers && (c->qops & DIGEST_MD5_QOP_AUTH_CONF))
return -1;
return 0;
}
int
digest_md5_validate_response (digest_md5_response *r)
{
/* This directive is required and MUST be present exactly
once; otherwise, authentication fails. */
if (!r->username)
return -1;
/* This directive is required and MUST be present exactly
once; otherwise, authentication fails. */
if (!r->nonce)
return -1;
/* This directive is required and MUST be present exactly once;
otherwise, authentication fails. */
if (!r->cnonce)
return -1;
/* This directive is required and MUST be present exactly once;
otherwise, or if the value is 0, authentication fails. */
if (!r->nc)
return -1;
/* This directive is required and MUST be present exactly
once; if multiple instances are present, the client MUST
abort the authentication exchange. */
if (!r->digesturi)
return -1;
/* This directive is required and MUST be present exactly
once; otherwise, authentication fails. */
if (!*r->response)
return -1;
if (strlen (r->response) != DIGEST_MD5_RESPONSE_LENGTH)
return -1;
/* This directive MUST appear exactly once if "auth-conf" is
negotiated; if required and not present, authentication fails.
If the client recognizes no cipher and the server only advertised
"auth-conf" in the qop option, the client MUST abort the
authentication exchange. */
if (r->qop == DIGEST_MD5_QOP_AUTH_CONF && !r->cipher)
return -1;
if (r->qop != DIGEST_MD5_QOP_AUTH_CONF && r->cipher)
return -1;
return 0;
}
int
digest_md5_validate_finish (digest_md5_finish *f)
{
if (!*f->rspauth)
return -1;
/* A string of 32 hex digits */
if (strlen (f->rspauth) != DIGEST_MD5_RESPONSE_LENGTH)
return -1;
return 0;
}
int
digest_md5_validate (digest_md5_challenge *c, digest_md5_response *r)
{
if (!c->nonce || !r->nonce)
return -1;
if (strcmp (c->nonce, r->nonce) != 0)
return -1;
if (r->nc != 1)
return -1;
if (!c->utf8 && r->utf8)
return -1;
if (!((c->qops ? c->qops : DIGEST_MD5_QOP_AUTH) &
(r->qop ? r->qop : DIGEST_MD5_QOP_AUTH)))
return -1;
if ((r->qop & DIGEST_MD5_QOP_AUTH_CONF) && !(c->ciphers & r->cipher))
return -1;
/* FIXME: Check more? */
return 0;
}
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